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I run vp u4.1 mixed with c12 and get a really good gain from that being oxygenated after running an oxygenated fuel i won't run anything else

Race fuel and pump gas should not be mixed because there is additives and preservatives in pump gas unlike race gas has no presevatives. I mix vp c12, u2, and u4 and bumped my jetting up 4 sizes and it makes an unbelsivable difference in throttle response and power.